Duplexing
A single communications channel can only be used to transmit information one way, as in a broadcast radio or TV station. Simple two-way radios use the same channel for both, but require the radio to stop receiving information when it is transmitting—the user holds down a switch while talking, then releases it to listen for a reply. True two-way or duplex communication requires two channels.
FDD
Frequency Division Duplex (FDD) uses two separate frequency bands, meaning that the mobile terminal is transmitting on one frequency while receiving on another. The frequency at which the base station transmits is called the downlink, and the frequency at which the mobile terminal transmits is called the uplink. Satellite systems often have ...
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